POLL: Which lower-seeded team will pull off the biggest upset?

The brackets are set. The 2010 MLS Cup Playoffs will get underway this week — and as RSL proved last year, once you're in it, you can win it — no matter where you're seeded. The reigining champions entered last year's postseason as the lowest-seeded team, but the Claret-and-Cobalt rode their underdog status all the way to hoisting the trophy.

What about this year? All four of the lower-seeded teams are looking very strong going into the playoffs. Colorado gave RSL a scare on Saturday, FC Dallas went on a torrid unbeaten streak, Seattle have proven near-unbeatable down the stretch and San Jose boast this year's Golden Boot winner. But which team will pull off the biggest upset in their conference semifinal series? Let us know!